Improved ECC-based privacy protection protocol for VANET

• 1、School of Cyberspace Security, Beijing University of Posts and Telecommunications,Beijing 100876

Abstract：The vehicular ad-hoc network is the most widely used intelligent transportation system and plays an indispensable role in road safety and traffic control. With the intelligence of the vehicular ad-hoc network, privacy leakage occurs frequently, resulting in increasingly serious data security issues and traffic safety problems. Therefore, it is still a challenge to ensure the conditional privacy security of vehicles while ensuring the system security and taking into account the limited computing and communication resources of the vehicular network system. To better solve this problem, this paper firstly analyzes the security of a conditional privacy protection scheme based on a certificateless cryptosystem, and finds that it cannot resist counterfeit attacks and denial of service attacks. Secondly, based on the analysis, an improved and more secure conditional privacy protection scheme is proposed, in which a new pseudonym generation method is designed to guarantee the conditional privacy of vehicles. Finally, in terms of security, this paper proves that this scheme can resist modification attacks, man-in-the-middle attacks, impersonation attacks and replay attacks, and meets the current security requirements of VANET.

Keywords： VANET conditional privacy protection elliptic curve cryptosystem